Add Docker support and installation guide for easy server deployment

Includes a Dockerfile for building the application image and an INSTALLATION.md file detailing the setup process, prerequisites, and helpful commands for managing the application on a private server.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: ae4037a0-2a6f-4530-9bac-79b543286bda
Replit-Commit-Checkpoint-Type: intermediate_checkpoint
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/397bca8c-984f-43ff-841a-10897aeb8140/ae4037a0-2a6f-4530-9bac-79b543286bda/ds3R7vP

Dockerfile

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+# Étape 1: Build de l'application
+FROM node:20-alpine AS builder
+
+WORKDIR /app
+
+# Copier les fichiers de dépendances
+COPY package*.json ./
+
+# Installer toutes les dépendances (dev + prod)
+RUN npm ci
+
+# Copier le reste du code source
+COPY . .
+
+# Build du frontend
+RUN npm run build
+
+# Étape 2: Image de production
+FROM node:20-alpine
+
+WORKDIR /app
+
+# Installer uniquement les dépendances de production
+COPY package*.json ./
+RUN npm ci --only=production
+
+# Copier les fichiers buildés et le code serveur
+COPY --from=builder /app/dist ./dist
+COPY --from=builder /app/server ./server
+COPY --from=builder /app/shared ./shared
+COPY --from=builder /app/drizzle.config.ts ./
+
+# Créer le dossier uploads
+RUN mkdir -p uploads
+
+# Exposer le port 5000
+EXPOSE 5000
+
+# Variables d'environnement par défaut
+ENV NODE_ENV=production
+ENV PORT=5000
+
+# Démarrer l'application
+CMD ["node", "dist/server.js"]